A Coal Mine Gas Drilling Rig Drill Rod Feed Depth Measurement System Based on NO2 Absorption Characteristics

Abstract

The invention relates to a coal mine gas drilling rig drill pipe feed depth measurement system based on NO2 absorption characteristics, which includes a hole sealing module and a cavity ring-down measuring NO2 concentration module; the hole sealing module includes a sealing plate, an annular sealing O ring, a ventilation The small hole, the connecting end of the ring-down cavity leather tube, the connecting end of the sample gas tube, and the coal and rock fixing parts are used to seal the gas in the drilling hole and control the entry and exit of NO2 gas; the cavity ring-down measuring NO2 concentration module is used to measure The diluted NO2 concentration; the high-concentration NO2 sample gas, the flow control valve and the sample gas solenoid valve are used to pour quantitative high-concentration NO2 into the hole; The gas in the hole is provided to the cavity; the system belongs to the post-drilling measurement technology, which uses cavity ring-down technology to measure the diluted NO2 concentration in the hole, and then calculates the depth of the hole, avoiding complex downhole environment and hole collapse influence, which improves the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of coal mine detection, in particular to a coal mine gas drilling rig drill pipe feed depth measurement system based on NO2 absorption characteristics. Background technique [0002] Coal mine gas is an important factor related to coal mine safety, and gas outburst can easily cause mine accidents. For this reason, the National Coal Mine Safety Supervision Bureau summarized and put forward the policy of "exhausting first, then mining, monitoring and monitoring, and determining production by wind". Gas extraction has become a prerequisite for coal mining. At present, for gas extraction, the coal mine gas drilling rig is used to drive a certain length of drill pipe into the coal seam, and then pull out the drill pipe after reaching a specified depth, thereby forming a hole for gas extraction. The methane-dominated coalbed methane will expel the high concentration of methane through pores, accompanied by a small...

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Problems solved by technology

[0004] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a coal mine gas drilling rig drill rod feed depth measurement system based on NO2 absorption characteristics, which belongs to the post-drilling measurement technology, and uses cavity ring-down technology to measure the diluted NO2 in the hole. NO2 concentration, and then calculate the depth of the hole, avoiding the influence of complex underground environment and hole collapse, improving measurement accuracy, eliminating misreporting and misreporting depth caused by external and human factors, and ensuring the safety of coal mining

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